JP2015061479A - Electric apparatus for power distribution - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power distribution electric apparatus capable of diagnosing the degree of deterioration of a tank accommodating an electric apparatus body.SOLUTION: The power distribution electric apparatus, including the electric apparatus body accommodated in a metal tank 1, further includes a deterioration state detection unit 2, including a deterioration detection sensor 201 having at least one event target that reflects the degree of deterioration of the tank among events detected in the tank 1, for outputting a deterioration state detection signal including information of the degree of deterioration of the tank, by using the output of the deterioration detection sensor 201; and a deterioration state detection signal transmission unit 3 for transmitting the deterioration state detection signal to a master station 4 installed on a power distribution system. This enables the master station side of the power distribution system to determine the degree of deterioration of the tank in the power distribution electric apparatus installed on each place in the power distribution system.

Description

  The present invention relates to an outdoor installation type electric power distribution device such as a pole transformer.

  In power distribution electrical equipment installed outdoors, such as pole transformers, safety is ensured and equipment is protected by housing the electrical equipment body in a tank. In this type of electrical equipment, anti-corrosion coating is applied to provide weather resistance to the tank. However, if the coating is defective, corrosion (oxidation) of the tank progresses from the defective portion, and the tank becomes early. To life. Even if there is no defect in the coating, if the coating is deteriorated by long-term use, the tank will be corroded from the deteriorated portion, and the tank will eventually reach the end of its life. When the life of the tank is exhausted, the protection function of the tank is lost, and the function of the electric device itself is eventually reduced.To maintain the power distribution system in a normal state, it is necessary to replace the electric device itself. I need it.

  As mentioned above, in the electrical equipment that houses the electrical equipment body in the tank, the life of the tank is one of the factors that determine the life of the electrical equipment, so in order to properly maintain the distribution system It is preferable to be able to determine the degree of deterioration of the tank containing the electric device main body.

  Therefore, as described in Patent Document 1 and Patent Document 2, the tank image data obtained by imaging the external appearance of the tank of the electrical distribution equipment with a digital camera is accumulated, and the accumulated image data is used. Proposals have been made to diagnose the degree of tank degradation. In this conventional diagnostic method, tank rust is detected from image data obtained by imaging with a digital camera, and the degree of deterioration of the tank is diagnosed from the detected degree of rust.

JP 2009-118585 A JP2011-259575A

  As shown in Patent Document 1 and Patent Document 2, when tank rust is detected from image data obtained by capturing the appearance of a tank of an electric device with a digital camera, an image having a large amount of information Since it is necessary to store data, not only an enormous amount of memory is required, but also troublesome image processing must be performed, and thus it is inevitable that the cost required for diagnosing deterioration of the tank is increased. Many electrical devices for power distribution are installed in the power distribution system, and are installed not only in urban areas but also in mountainous areas. For each electrical device for power distribution, a camera that captures the appearance of the tank is installed. It is not easy to analyze the image data obtained from these cameras.

  Since the distribution system is managed at the sales office of the distribution system, in order to properly manage the distribution system, information on the degree of deterioration of the tanks of the distribution equipment installed in each part of the distribution system, It is preferable to be able to collect it at the master station installed at the sales office, but it is still possible to monitor the degree of deterioration of the tank of the power distribution equipment and send data indicating the degree of deterioration to the master station Not done.

  An object of the present invention is to provide a distribution electric device itself with a function of outputting a deterioration state detection signal including information on the degree of deterioration of the tank and a function of transmitting the deterioration state detection signal to a master station provided in the distribution system. The purpose of this is to allow the master station to monitor the degree of deterioration of the tanks of the electrical equipment for power distribution installed at various locations in the power distribution system without performing troublesome image data analysis.

The present specification discloses at least the following first to sixteenth inventions to achieve the above object.
The first invention is directed to electrical equipment for power distribution in which the main body of the electrical equipment is housed in a metal tank. The present invention relates to the degree of deterioration of the tank among events detected in the tank. A deterioration state detection unit having a deterioration detection sensor for detecting at least one reflected event, and outputting a deterioration state detection signal including information on the degree of deterioration of the tank using the output of the deterioration detection sensor; And a degradation state detection signal transmitting unit that transmits a degradation state detection signal output from the degradation state detection unit to a master station installed in the distribution system.

  The deterioration state detection unit may be configured to output the output of the deterioration detection sensor as it is as a deterioration state detection signal, a signal obtained by amplifying the output of the deterioration detection sensor as necessary, or a deterioration detection sensor. A signal obtained by performing noise removal processing on the output signal may be output as a degradation state detection signal.

  Of the events detected in the tank of the electrical distribution equipment as described above, an event that reflects the degree of deterioration of the tank is detected by the sensor, and information on the degree of deterioration of the tank is obtained from the output of this sensor. Then, it is possible to monitor the degree of deterioration of the tank of the electric appliance for power distribution without performing complicated image processing. In addition, if a deterioration state detection signal transmission unit is provided that transmits a deterioration state detection signal to the master station as described above, the master station grasps the degree of deterioration of the tanks of the distribution electrical equipment installed at various locations in the distribution system. Therefore, it is possible to appropriately manage the replacement timing of each electrical distribution device, and to eliminate the possibility of overlooking deterioration of the electrical distribution device and causing an accident.

  The second invention disclosed in the present application is applied to the first invention. In the present invention, a change in the appearance of the vibration of the tank caused by the transmission of the vibration generated by the electric device body is detected. The target event. In this case, the deterioration detection sensor is configured to output an electric signal including information on the vibration waveform of the tank, and the deterioration state detection unit detects the deterioration state of the electric signal including information on the vibration waveform detected by the deterioration detection sensor. It is configured to output as a signal.

  When tank deterioration (corrosion) progresses, the mass, density, hardness, etc. of the deteriorated part of the tank changes, so the waveform of the mechanical vibration of the tank that occurs when the mechanical vibration of the electrical equipment body is transmitted A waveform different from the state in which there is no deterioration of the tank is exhibited. Therefore, the degree of deterioration of the tank can be determined by comparing the vibration waveform of the tank with the vibration waveform detected with no deterioration of the tank or with the vibration waveform detected with less deterioration.

  The third invention disclosed in the present application is applied to the first invention, and also in the present invention, a change in the appearance of tank vibration caused by transmission of vibration generated by the electric device body is detected. As a target event, the deterioration detection sensor is configured to generate an electrical signal including information on the vibration waveform of the tank. In this case, the deterioration state detection unit determines the degree of deterioration of the tank from the waveform of the electrical signal output from the deterioration detection sensor, and outputs a deterioration state detection signal when the degree of deterioration exceeds the set range. Configured to do.

  The fourth invention disclosed in the present application is applied to the first invention, and also in the present invention, the change in the appearance of the vibration of the tank caused by the transmission of the vibration generated by the electric device main body is detected. As a target event, the deterioration detection sensor is configured to generate an electrical signal including information on the vibration waveform of the tank. The deterioration state detection unit determines the degree of deterioration of the tank by comparing the level of a specific frequency component extracted through the filter from the electrical signal output from the deterioration detection sensor with the determination value, and determines the degree of deterioration of the tank. A deterioration state detection signal is output when it is determined that the set range is exceeded.

  The fifth invention disclosed in the present application is applied to the first invention. In the present invention, the detection target event is the vibration of the tank caused by the transmission of the vibration generated from the electric device body. The first vibration measuring device for measuring the vibration level of the tank in the first portion of the tank, and the tank in the second portion set at a position away from the first portion of the tank. A second vibration measuring device that measures the vibration level of the sensor is provided as a deterioration detection sensor. In this case, the deterioration state detection unit uses the difference between the vibration level measured by the first vibration measuring device and the vibration level measured by the second vibration measuring device when the tank is not deteriorated as a determination value. When the difference between the vibration level measured by the vibration measuring device and the vibration level measured by the second vibration measuring device is equal to or greater than a determination value, a deterioration state detection signal is output.

  The sixth invention disclosed in the present application is applied to the fifth invention, and in the present invention, the first portion of the tank is set to a portion directly exposed to rain water on the outer surface of the tank or the inner surface of the tank. The second portion of the tank is set to a portion where rainwater on the outer surface of the tank is not directly applied.

  The portion directly exposed to rainwater on the outer surface of the tank is in a state where it is difficult to corrode because salt attached to the tank due to salt damage is washed away by rain. The inner surface of the tank is also difficult to corrode. On the other hand, in the portion where the rainwater on the outer surface of the tank is not directly applied, the adhered salt content is not washed away by rain, so that the salt content accumulates and is easily corroded. Therefore, if the first portion and the second portion are set as described above, the vibration level measured by the first vibration measuring device and the second vibration measuring device when the corrosion of the tank starts. A distinct difference can be made between the measured vibration level and the detection of the start of tank degradation.

  The seventh invention disclosed in the present application is applied to the first invention. In the present invention, the event to be detected is a change in electrical resistance of the tank, and the first part of the tank is A first resistance measuring device that measures the electrical resistance and a second resistance measuring device that measures the electrical resistance of the second portion set at a position away from the first portion of the tank are provided as deterioration detection sensors. It is done. In this case, the deterioration state detection unit outputs a deterioration state detection signal when the difference between the resistance value measured by the first resistance measuring instrument and the resistance value measured by the second resistance measuring instrument is equal to or greater than a set value. Configured as follows.

  The electric resistance value of the tank becomes larger as the corrosion of the tank proceeds. In general, the corrosion of the tank does not proceed uniformly over the entire tank, and the state of corrosion of each part of the tank differs depending on the environmental conditions to which each part of the tank is exposed. Accordingly, if the first part and the second part of the tank are properly set, the difference between the resistance value of the first part and the resistance value of the second part as the corrosion progresses. Thus, the degree of deterioration of the tank can be determined from the magnitude of the difference between the resistance values. Although the electrical resistance value of the tank is affected by the temperature of the tank, as described above, if the difference between the electrical resistance values of the two portions of the tank is taken, the influence of the temperature can be canceled. The degree of deterioration of the tank can be determined without being affected by the above.

  The eighth invention disclosed in the present application is applied to the seventh invention, and in the present invention, the first portion is set on the portion where the rain water is directly applied to the outer surface of the tank or the inner surface of the tank, and the tank A second portion is set in a portion where no rainwater is directly applied to the outer surface.

  When the first part and the second part are set as described above, the first part of the tank is not easily corroded, but the second part is easily corroded. A clear difference can be generated between the resistance value of the first part of the tank and the resistance value of the second part, and the degree of corrosion of the tank can be easily known by using this difference in resistance value. be able to.

  The ninth invention disclosed in the present application is applied to the first invention, and in the present invention, a temperature sensor for directly or indirectly measuring the temperature of the tank is provided. The event to be detected is a change in the electrical resistance of the tank, and the deterioration detection sensor is composed of a resistance measuring instrument that measures the electrical resistance of a specific portion set in the tank. In this case, the deterioration state detection unit converts the resistance value measured by the resistance measuring instrument into a resistance value at a predetermined standard temperature using the temperature detected by the temperature sensor, and the converted resistance value is a predetermined determination value. When it is above, it is comprised so that a degradation state detection signal may be output.

  By detecting the temperature of the tank as described above and converting the electrical resistance value measured by the resistance measuring instrument into the resistance value at the standard temperature, the deterioration of the tank is not affected by the tank temperature. Can be determined.

  The tenth invention disclosed in the present application is applied to the first invention, and in the present invention, the event to be detected is a change in the color of the tank caused by the deterioration of the tank, The deterioration detection sensor is composed of a color sensor that detects the color of a specific portion set in the tank. In this case, the deterioration state detection unit is configured to output a signal including color information detected by the color sensor as a deterioration state detection signal.

  The eleventh invention disclosed in the present application is applied to the first invention, and in the present invention, the event to be detected is a change in the color of the tank caused by the deterioration of the tank, The deterioration detection sensor is composed of a color sensor that detects the color of a specific portion set in the tank. In this case, the deterioration state detection unit determines the degree of deterioration of a specific portion of the tank from the color detected by the color sensor, and the deterioration state is detected when the determined degree of deterioration exceeds a preset range. A detection signal is generated.

  The twelfth invention disclosed in the present application is applied to the first invention. In the present invention, an event to be detected is a change in dielectric constant accompanying deterioration of a specific portion of a tank. The deterioration detection sensor is configured to detect a capacitance between a pair of electrodes arranged to face each other with a specific portion of the tank therebetween. In this case, the deterioration state detection unit is configured to generate a deterioration state detection signal when it is detected that the capacitance detected by the deterioration detection sensor is equal to or greater than a set determination value.

  The thirteenth invention disclosed in the present application is applied to any of the ninth to twelfth inventions. In the present invention, a specific portion of the tank is set to a portion where rainwater is not directly applied.

  A fourteenth invention disclosed in the present application is directed to an electric device for power distribution in which an electric device main body is housed in a metal tank. The present invention relates to a tank among events detected in a tank. The degree of tank deterioration is set from a signal output from one of the plurality of deterioration detection sensors, each of which includes a plurality of deterioration detection sensors that detect a plurality of events that reflect the degree of deterioration of the tank. A degradation state detection unit that generates a degradation state detection signal when it is determined that the degradation state has been reached, and a degradation state detection signal transmission that transmits the degradation state detection signal generated by the degradation state detection unit to a master station installed in the distribution system And a section.

  The fifteenth invention disclosed in the present application is applied to the fourteenth invention. In the present invention, a plurality of events to be detected are generated in the tank by transmitting vibrations generated in the electric device body. Select from 4 events consisting of vibration mode, change in tank electrical resistance, change in tank color caused by tank deterioration, and change in tank dielectric constant caused by tank deterioration It is characterized by being.

  The sixteenth invention disclosed in the present application is applied to the fourteenth or fifteenth invention, and in the present invention, the detection of the event to be detected is performed by detecting rainwater directly on the outer surface of each part of the tank. It is done in a specific part set to the part that does not take.

  As described above, if the degree of deterioration of the tank is detected at a portion that is easily corroded because it is not directly exposed to rain, the deterioration of the tank can be known at an early stage. In particular, in the case where insulating oil is contained in the tank, if the bottom of the tank is corroded, the insulating oil leaks and the insulation performance of the electrical equipment is lost, so to prevent accidents from occurring in the electrical equipment. It is preferable to detect deterioration of the bottom of the tank.

  According to the present invention, among the events detected in the tank of the electrical equipment for power distribution, an event that reflects the degree of deterioration of the tank is detected by the sensor, and information relating to the degree of deterioration of the tank is detected from the output of this sensor. Therefore, the deterioration of the tank of the electrical equipment for distribution can be achieved without performing complicated signal processing as in the case of detecting the deterioration state of the tank from the image data obtained by imaging the appearance of the tank with the camera. Can be monitored. In addition, since a degradation status detection signal transmission unit that transmits degradation status detection signals to the master station is provided, the master station grasps the degree of degradation of the tanks of the electrical equipment for distribution installed at various locations in the distribution system. It is possible to properly manage the replacement timing of the electrical equipment for electric power, and to eliminate the possibility of causing a power outage accident by overlooking the deterioration of the electrical equipment for power distribution.

It is the block diagram which showed one structural example of the degradation condition monitoring apparatus provided in order to monitor the degradation condition of a tank in the electrical equipment for power distribution which concerns on this invention. FIG. 5 is a block diagram showing another configuration example of a deterioration state monitoring device provided for monitoring the deterioration state of a tank in the electrical distribution equipment according to the present invention. 1 is a cross-sectional view illustrating an example of a state in which a vibration measuring device is attached to a tank of an electric device in an embodiment of an electric device for power distribution according to the present invention. It is the block diagram which showed the example of a structure of the deterioration monitoring apparatus using the vibration measuring device shown in FIG. FIG. 6 is a cross-sectional view showing another example of a state in which a vibration measuring device is attached to a tank of the electric device in an embodiment of the electric device for power distribution according to the present invention. It is the block diagram which showed the structural example of the deterioration monitoring apparatus using the vibration measuring device shown in FIG. In other embodiment of the electrical equipment for power distribution which concerns on this invention, it is sectional drawing which showed an example of the state which attached the resistance measuring device to the tank of the electrical equipment. It is the block diagram which showed the structural example of the deterioration monitoring apparatus using the resistance measuring device shown in FIG. In other embodiment of the electrical equipment for power distribution which concerns on this invention, it is sectional drawing which showed an example of the state which attached the temperature sensor and the resistance measuring device to the tank of this electrical equipment. It is the block diagram which showed the structural example of the deterioration monitoring apparatus using the temperature sensor and resistance measuring device which were shown in FIG. FIG. 10 is a cross-sectional view illustrating an example of a state in which a color sensor is attached to a tank of an electric device in still another embodiment of the electric device for power distribution according to the present invention. It is the block diagram which showed the example of a structure of the deterioration monitoring apparatus using the color sensor shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The present invention is intended for electrical distribution equipment having a structure in which the main body of the electric device is housed in a metal tank. A typical example is a pillar in which the transformer body is housed in the tank together with insulating oil. It is an upper transformer.

  In the present invention, a degradation state monitoring device that monitors the degradation state of the tank of the electrical distribution equipment is attached to the electrical distribution equipment itself. FIG. 1 shows a configuration example of a deterioration state monitoring apparatus used in the present invention. In the figure, 1 is a tank of electrical equipment for power distribution, 2 is a deterioration state detection unit that outputs a deterioration state detection signal including information on the degree of deterioration of the tank, and 3 is a master station installed in the distribution system. 4 is a degradation state detection signal transmission unit to be transmitted to 4.

  The deterioration state detection unit 2 shown in FIG. 1 includes a deterioration detection sensor 201 that detects at least one event that reflects the degree of deterioration of the tank among events detected in the tank 1, and outputs the deterioration detection sensor 201. And amplifying circuit 202 for amplifying, and outputting a deterioration state detection signal including information on the degree of deterioration of tank 1. The event indicating the degree of deterioration of the tank is, for example, a change in the state of mechanical vibration of the tank 1 caused by being excited by electromagnetic vibration generated by the electric device body, a change in the electric resistance of the tank, These include changes in color and changes in the dielectric constant of the tank.

  In the illustrated example, the deterioration state detection unit 2 is provided with the amplifier circuit 202 that amplifies the output of the deterioration detection sensor 201. However, the signal output from the deterioration detection sensor 201 is sufficiently large and the signal output from the deterioration detection sensor. If the deterioration state detection signal transmitter 3 can recognize the signal without amplifying the signal, the amplifier circuit 202 can be omitted. Further, when noise is included in the output signal of the deterioration detection sensor 201, it is preferable to add a filter for removing noise to the subsequent stage of the deterioration detection sensor 201.

  The deterioration state detection signal transmission unit 3 is a part having a function of transmitting the deterioration state detection signal to the master station 4 installed in a sales office or the like of the distribution system (a place where the distribution system is managed). The degradation state detection signal transmission unit 3 is configured to transmit a signal obtained by modulating a carrier signal with a degradation state detection signal to the parent station 4 when a transmission request is received from the parent station.

  The method by which the deterioration state detection signal transmission unit 3 transmits the deterioration state detection signal is arbitrary, and may be transmitted by the power line carrier method or may be performed by the wireless communication method. When an optical cable is installed in the power distribution system, it may be performed by optical communication. Communication between the degradation state detection signal transmission unit and the master station may be performed using the Internet or may be performed through a communication network of a mobile phone.

  Thus, an event reflecting the degree of deterioration of the tank 1 is detected by the sensor, and a signal including information on the degree of deterioration detected by the sensor can be transmitted to the master station as a deterioration state detection signal. In other words, the department that manages the distribution system can analyze the deterioration state detection signal received by the master station, thereby grasping the degree of deterioration of the tanks of the distribution electrical equipment installed at various points in the system.

  In the example shown in FIG. 1, the deterioration state detection unit 2 is configured to output the output signal of the deterioration detection sensor 201 as it is or a signal obtained by amplifying the output of the deterioration detection sensor as a deterioration state detection signal. However, the deterioration state detection unit 2 may be configured to output a signal obtained by performing processing for extracting the degree of deterioration on the output signal of the deterioration detection sensor as a deterioration state detection signal. .

  For example, as shown in FIG. 2, a comparison determination unit 203 that compares the level of the detection signal obtained from the deterioration detection sensor 201 through the amplifier circuit 202 with the determination level is further provided in the deterioration state detection unit 2. When the level of the detection signal obtained is equal to or higher than a predetermined determination level, the degree of deterioration of the tank 1 has reached the set degree (for example, the tank has been deteriorated to the extent that it will reach the end of its life in the near future) The deterioration state detection unit 2 may be configured so as to output a deterioration state detection signal indicating the above.

  Of the events detected in the tank of the electrical equipment for power distribution as described above, an event that reflects the degree of deterioration of the tank 1 is detected by the deterioration detection sensor 201, and the degree of deterioration of the tank is determined from the output of this sensor. When information is obtained, it is possible to monitor the degree of deterioration of the tank of the electrical equipment for power distribution without performing complicated signal processing. In addition, if the deterioration state detection signal transmission unit 3 for transmitting the deterioration state detection signal to the master station as described above is provided, the degree of deterioration of the tanks of the electric appliances for distribution installed in various places in the distribution system is determined by the master station. Since it is possible to grasp, it is possible to appropriately manage the replacement timing of each electrical distribution device, and it is possible to eliminate the possibility of overlooking the degradation of the electrical distribution device and causing a power outage accident.

  Hereinafter, a more specific embodiment of the present invention will be described with reference to an example in which the present invention is applied to a pole transformer. FIG. 3 shows a tank 1 of a pole transformer. The illustrated tank 1 includes a cylindrical tank body 101 having a peripheral wall portion 101a and a bottom wall portion 101b, and an opening at the upper end of the tank body 101. The upper lid 102 is closed. A flange portion 101c is formed at the upper end of the tank body 101 by folding the upper end of the peripheral wall portion 101a outward. In order to close the upper end opening of the tank body, an upper lid 102 formed to have a shallow cylindrical shape is fitted to the flange portion 101c. A cylindrical leg portion 101d is attached to the bottom wall portion 101b of the tank body 101 by welding. Although not shown, the transformer body is accommodated in the tank 1 together with the insulating oil, and the pole transformer is constituted by the tank 1 and the transformer body accommodated therein. A column fitting (not shown) is attached to the peripheral wall portion 101a of the tank body 101 by welding, and a pole transformer is attached to the utility pole using the column fitting. Each part of the tank 1 is made of metal such as iron or stainless steel, and in order to prevent the tank 1 from being rusted, its inner surface and outer surface are subjected to electrodeposition coating.

  In the above description, the tank body 101 is formed in a cylindrical shape. However, in the present invention, the shape of the tank body 101 is arbitrary. For example, the tank body 101 may be formed to have a substantially rectangular tube shape. Further, in order to improve the heat radiation from the transformer, a heat radiating rib made of a corrugated plate may be welded to the outer periphery of the tank main body 101, and the portion excluding the upper end and the lower end of the peripheral wall portion 101 of the tank main body There are also cases where the oil passage is formed inside the crest of the corrugated plate, which is constituted by corrugated plates having a shape in which ridges and valleys are alternately arranged. The upper lid 102 is formed in an appropriate shape according to the shape of the tank body.

  Since the tank 1 is attached to a utility pole and exposed to wind and rain, if it is installed for many years, the coating on the outer surface of the tank 1 may deteriorate and the metal part may deteriorate (corrode). As the deterioration of the tank progresses, a hole is formed in the deteriorated part, and the insulating oil leaks, resulting in a state where the insulation performance of the transformer is lowered. In such a state, there is a possibility that a ground fault accident or a short-circuit accident will occur in the transformer, so it is necessary to replace the transformer. In order to operate the power distribution system stably, the degree of deterioration of the pole transformer tanks installed at various locations is monitored, and before the tank deterioration progresses to a fatal state where the tank has holes. It is preferable to replace the electrical equipment for power distribution. To that end, it is necessary to constantly monitor the degree of deterioration of the tank 1 of the pole transformer installed in each place of the power distribution system so that the replacement timing of each pole transformer can be known with a margin. preferable.

  At present, the external appearance of the tank of each pole transformer is confirmed by visual observation, the image data obtained by imaging the external appearance of the tank with a digital camera is analyzed, the presence or absence of discolored parts due to the rust of the tank, and the progress of rust The degree of deterioration of the tank is monitored by judging the presence or absence of the swelling of the paint film that accompanies this. It is difficult for the workers to make a round trip, and it is difficult to monitor the pole transformer installed in the mountainous area with sufficient frequency.

  Therefore, in the present invention, by attaching a deterioration state monitoring device for monitoring the deterioration of the tank to the pole transformer, and having the function of monitoring the tank deterioration in the pole transformer itself, The master station installed in the power distribution system can know the state of deterioration of each pole transformer tank without relying on patrol.

  In the present invention, in order to detect the degree of deterioration of the tank, among the events observed in each part of the tank, an event reflecting the state of deterioration of the tank is detected by the sensor, and information on the degree of deterioration is included. Send the signal to the master station. In order to know the deterioration of the tank with a margin, it is preferable to detect an event in which the degree of deterioration of the tank is reflected at a portion where the deterioration is likely to proceed among the parts of the tank.

  In the tank 1 of the pole transformer, the portion where corrosion proceeds relatively quickly is a portion where salt water attached by salt damage (salt content carried by wind) is likely to accumulate because rainwater is not directly applied. In the tank shown in FIG. 3, in the bottom wall portion 101b of the tank body, a portion located inside the leg portion 101d, particularly a portion near the leg portion 101d and a lower portion of the flange portion 101c at the upper end of the tank body. Salt easily accumulates and tank corrosion tends to proceed at these portions. Since the salt attached to the outer peripheral surface of the tank body 101 is washed away by rain when it rains, the salt does not accumulate on the outer peripheral surface of the tank main body, and the progress of corrosion on the outer peripheral surface of the tank main body is generally slow. .

  Therefore, in detecting the degree of deterioration of the tank 1 shown in FIG. 3, when detecting the degree of deterioration of the tank from the output of a single sensor, the leg part 211 of the bottom wall part 101b of the tank 1 is used. It is preferable that the sensor is attached to a portion where corrosion proceeds relatively quickly, such as a portion near the bottom, or a lower portion of the flange portion 101c at the upper end of the tank main body 101. In the present embodiment, the vibration measuring device 211 for detecting this event is used as the event to detect the state of the mechanical vibration of the tank generated by the mechanical vibration of the transformer main body being transmitted to the tank 1. The bottom wall 101b is attached to the portion near the leg 211. As the vibration measuring instrument 211, a piezoelectric sensor, an acceleration sensor, or the like can be used. In the present embodiment, the vibration measuring device 211 constitutes a deterioration detection sensor, and the vibration measuring device 211 generates an electrical signal including information on the vibration waveform of the tank 1.

  In the transformer main body, electromagnetic vibration of the coil having a fundamental frequency of 50 Hz or 60 Hz (100 Hz or 120 Hz) and magnetostrictive vibration of the iron core are generated, and these vibrations are transmitted to the tank 1. Therefore, the tank 1 also vibrates. The vibration of the tank 1 is a vibration whose fundamental frequency is the vibration frequency of the transformer body, but the vibration generated in each part of the transformer body is transmitted to the tank 1 with a phase difference through various transmission paths. The vibration waveform generated in 1 is not the same as the vibration waveform of the transformer body, and includes a harmonic component that is an integral multiple of the fundamental frequency in addition to the fundamental frequency component of the transformer body vibration. . Therefore, the mechanical vibration waveform generated in the tank 1 is not a sine wave but a distorted waveform including harmonics. This tank vibration waveform is not corroded by the tank, and the hardness and elasticity of the entire tank. When the tank is in a high state, the corrugated portion of the tank is corroded and the corrugated portion has a corrugated portion that exhibits a different waveform. When the vibration of the tank is measured at the specific part of the tank by the vibration measuring device 211, when the specific part is not corroded, vibration having a large amplitude is measured. When the specific part is corroded, the amplitude is measured. A small vibration is measured.

  Therefore, a specific frequency component included in the vibration waveform measured by the vibration measuring device 211 is extracted by a filter, and the level of the extracted frequency component is compared with a determination value or the vibration measured by the vibration measuring device 211 is measured. By comparing the level of the fundamental frequency component with a determination value, it can be determined whether or not corrosion has progressed in the tank. When detecting the degree of corrosion of the tank, which of the fundamental frequency component and the harmonic component of the vibration waveform detected by the vibration measuring device 211 should be used for the determination is determined between the structure of the tank and the tank and the transformer body. It differs depending on the positional relationship between them or the location where the vibration measuring device is installed. Therefore, which of the fundamental frequency component and the harmonic component of the vibration waveform should be used for the determination is determined based on the experimental results.

  FIG. 4 shows a configuration example of a deterioration state monitoring device configured using the vibration measuring device 211 attached to the tank 1 as shown in FIG. In the example shown in FIG. 4, the vibration measuring device 211, the filter 212 for extracting the frequency component used for determining the degree of deterioration from the output of the vibration measuring device 211, and the level of the frequency component extracted by the filter 212 are set in advance. When it is determined that the degree of deterioration of the tank has reached the set level (for example, to the extent that a transformer needs to be replaced in the near future) When the deterioration of the tank is determined to be advanced), the deterioration determination unit 213 outputs a deterioration state detection signal indicating that the degree of deterioration of the tank has reached the set degree. 2 is configured. Since the determination value given to the comparison determination unit 213 is theoretically difficult to obtain, it is determined based on data obtained through experiments. When the level of the extracted frequency component is equal to or higher than the determination value, it is determined that the degree of deterioration of the tank has reached the set level, or when the level of the extracted frequency component is less than the determination value Whether it is determined that the degree of deterioration of the tank has reached the set level depends on how to select the frequency component and the determination value extracted by the filter. For example, when a frequency component whose level increases as the degree of tank deterioration progresses is extracted by a filter and used for determination, the deterioration state is detected when the level of the extracted frequency component exceeds a determination value. Output a signal.

  The output of the deterioration state detection unit 2 is given to the deterioration state detection signal transmission unit 3. The degradation state detection signal transmission unit 3 transmits a signal obtained by modulating the carrier signal with the degradation state detection signal to the master station 4 through a communication network provided in the distribution system. A deterioration state monitoring device is configured by the deterioration state detection unit 2 and the deterioration state detection signal transmission unit 3.

  Although not shown in FIG. 4, a DC power supply circuit is required to operate the deterioration state detection unit 2 and the deterioration state detection signal transmission unit 3. This DC power supply circuit is accommodated in the tank 1. The transformer body can be configured by a transformer that steps down the voltage on the low voltage side of the transformer body, a rectifier circuit that rectifies the output of the transformer, and a circuit that stabilizes the output of the rectifier circuit. Also, a power generation means using renewable energy such as a solar cell, an energy storage means such as a capacitor for storing electric power generated by the power generation means, and a constant DC voltage is generated using a voltage at both ends of the storage means as a power supply voltage. The DC power supply circuit can also be configured by a circuit that performs the above.

  The deterioration detection sensor portion of the deterioration monitoring device is attached to the tank, but the portions other than the deterioration detection sensor may be accommodated in the case and attached to the outer surface of the tank, or may be accommodated in the tank 1. You may keep it. Similarly to the switch slave station connected to the load switch via a cable, the parts other than the deterioration detection sensor of the deterioration monitoring device are attached to the transformer in the form of a slave station connected to the transformer via a cable. You may make it leave.

  In the example shown in FIG. 3, one vibration measuring device 211 is attached to a portion where the tank is easily corroded. However, in order to detect the deterioration of the tank more reliably, a distance is provided between the portion where the tank is easily corroded. When the vibration measuring device 211 is attached to each of the two or more set mounting locations, and the level of the signal extracted from the signal output by at least one of the plurality of vibration measuring devices is equal to or higher than the judgment value, The deterioration state detection unit 2 may be configured to determine that the degree of deterioration has reached the set degree.

  In the example shown in FIG. 4, the signal indicating that the degree of deterioration of the tank has reached the set level by comparing the level of the signal of the predetermined frequency extracted from the output of the vibration measuring device 211 with the determination value. The signal is output as a deterioration state detection signal. However, the output signal itself of the vibration measuring device 211 or a signal obtained by amplifying the output of the filter 212 as necessary is output as a deterioration state detection signal. In addition, the deterioration state detection unit 2 can be configured. In this case, the progress of the deterioration of the tank is performed on the master station side.

  FIG. 5 shows another embodiment of the present invention. In the present embodiment, a change in the level of vibration of the tank 1 caused by transmission of vibration generated by the transformer main body (electric device main body) (electromagnetic vibration generated by the coil and magnetostrictive vibration generated by the iron core) is set as a detection target. As a phenomenon, the first vibration measuring device 221 that measures the vibration level of the tank in the first part of the tank 1, and the vibration level of the tank in the second part set at a position away from the first part of the tank A second vibration measuring device 222 that measures the above is attached to the tank as a deterioration detection sensor. Here, the first portion of the tank to which the first vibration measuring device 221 is attached is set to a portion where rainwater is directly applied to the outer surface of the tank or a portion where corrosion gradually progresses, such as the inner surface of the tank. The second portion of the tank to which the measuring device 222 is attached is set to a portion where corrosion proceeds relatively quickly, such as a portion where the rainwater on the outer surface of the tank is not directly exposed. In the illustrated example, the first portion of the tank to which the first vibration measuring device 221 is attached is set on the outer peripheral surface of the tank main body 101, and the second portion of the tank to which the second vibration measuring device 222 is attached is the tank main body. The bottom wall 101b is set at a portion closer to the leg 101d.

  FIG. 6 shows a configuration example of the deterioration state detection unit 2 when the first vibration measuring device 221 and the second vibration measuring device 222 are provided as shown in FIG. In this example, the vibration level detected by the first vibration measuring device 221 and the vibration level measured by the second vibration measuring device 222 are input to the vibration level difference calculating unit 223, and the vibration level difference calculating unit 223 The difference between the vibration level detected by the first vibration measuring instrument 221 and the vibration level measured by the second vibration measuring instrument 222 is calculated. The difference between the vibration levels calculated by the vibration level difference calculation unit 223 is input to the comparison determination unit 224 together with a predetermined determination value. The comparison determination unit 224 indicates a deterioration state detection signal indicating that the degree of deterioration of the tank has reached the set level when the difference in vibration level calculated by the vibration level difference calculation unit 223 is equal to or greater than the determination value. Is output.

  In the corroded portion of the tank 1, the hardness and density of the tank are lowered and the elasticity is lowered, so that the amplitude of vibration is smaller than that in the portion that is not corroded. Therefore, as the deterioration of the tank progresses, the vibration level measured by the second vibration measuring instrument 222 attached to the portion where corrosion progresses quickly becomes the first vibration measurement attached to the portion where corrosion progresses slowly. And the difference between the vibration level measured by the first vibration measuring instrument 221 and the vibration level measured by the second vibration measuring instrument 222 is increased. Go. Therefore, when the difference between the vibration levels measured by the first and second vibration measuring devices reaches a predetermined determination value, the deterioration state detection indicating that the degree of deterioration of the tank has reached the set level. A signal can be output from the comparison determination unit 224.

  In order to reliably detect corrosion of the tank, a plurality of second vibration measuring devices 222 are provided, and the plurality of second vibration measuring devices are attached to a plurality of positions set in a portion where the tank is easily corroded. May be. In this case, only one first vibration measuring device 221 needs to be provided. As described above, when a plurality of second vibration measuring devices 222 are provided, the vibration level detected by each second vibration measuring device 222 is compared with the vibration level detected by the first vibration measuring device 221. For example, when the difference between the vibration level detected by at least one second vibration measuring device 222 and the vibration level detected by the first vibration measuring device 221 is equal to or greater than a determination value, the deterioration state detection signal is output. Make it output.

  As shown in FIG. 6, even when the first vibration measuring device and the second vibration measuring device are provided, the first vibration is used to perform signal processing for determining the degree of deterioration on the master station side. The output signal of the measuring instrument and the output signal of the second vibration measuring instrument are transmitted as they are, or the signals obtained by amplifying these signals are used as they are as the deterioration state detection signals, and are transmitted to the master station by the deterioration state detection signal transmitter 3. You may comprise as follows.

  In the example shown in FIGS. 3 and 5, the vibration measuring device is attached to the outer surface of the tank. However, the vibration measuring devices 211, 221, and 222 may be attached so as to measure the vibration of the tank inside the tank. In particular, since the inner surface of the tank is not easily rusted, when the first vibration measuring device 221 is attached to the inner surface of the tank, the output of the first vibration measuring device 221 and the output of the second vibration measuring device 222 are accompanied by the deterioration of the tank. A clear difference can be generated between the two so that the degree of deterioration of the tank can be accurately determined.

  In general, when corrosion occurs in the tank 1, the electric resistance value of the corroded portion of the tank is larger than the electric resistance value of the non-corroded portion. Therefore, the event to be detected in order to detect the degree of deterioration of the tank 1 can be a change in the electrical resistance of the tank 1.

  In the case where the change in the electric resistance of the tank 1 is an event to be detected, for example, the electric resistance between a pair of terminals electrically connected to the tank 1 at a certain distance is used as the electric resistance value of the tank. Attach a resistance measuring instrument to the tank. FIG. 7 shows an example of a state in which such a resistance measuring device is attached to the tank 1. In this example, a first resistance measuring device 231 that measures the electrical resistance value of the tank at the first portion of the tank 1 and a second portion of the tank that is set at a position away from the first portion of the tank 1. And a second resistance measuring device 232 for measuring the electrical resistance of the tank is provided as a deterioration detection sensor.

  Here, the first portion of the tank to which the first resistance measuring device 231 is attached is set to a portion to which rainwater on the outer peripheral surface of the tank body 101 is directly applied, and the tank to which the second resistance measuring device 232 is attached. The second portion is set at a portion near the leg portion 101 d of the bottom wall portion 101 b of the tank main body 101. Each resistance measuring device is configured to measure an electrical resistance between a pair of electrodes t1 and t2 which are provided at a certain distance and are electrically connected to a metal portion of the tank. Note that the contact areas of the electrodes t1, t2 and the wall of the tank body are equal.

  In this case, the electrical resistance r between the electrodes t1 and t2 is obtained by measuring the current i flowing between the electrodes t1 and t2 when a constant DC voltage e is applied between the electrodes t1 and t2, and r = e / i. It can be measured by performing a calculation. Note that the first portion of the tank to which the first resistance measuring device 231 is attached may be set on another portion where corrosion hardly occurs or the corrosion gradually proceeds, for example, the inner surface of the tank main body 101.

  When the first resistance measuring device 231 and the second resistance measuring device 232 are provided as shown in FIG. 7, the first resistance measuring device 231 and the second resistance measuring device 232 as shown in FIG. The deterioration state detection unit 2 is configured by the comparison / determination unit 233 that compares the electrical resistance values measured by these resistance measuring devices. The comparison determination unit 233 detects the deterioration state when the difference between the electrical resistance value measured by the first resistance measuring device 231 and the electrical resistance value measured by the second resistance measuring device 232 is equal to or greater than a set determination value. Output a signal. This deterioration state detection signal is transmitted to the master station by the deterioration state detection signal transmitter 3.

  In general, the corrosion of the tank does not proceed uniformly throughout the tank, and the manner of the progress of the corrosion of each part of the tank differs depending on the environmental conditions to which each part of the tank is exposed. Accordingly, if the first portion and the second portion of the tank to which the first resistance measuring device 231 and the second resistance measuring device 232 are respectively attached are appropriately set, the first portion is developed as the corrosion progresses. It is possible to produce a clear difference between the resistance value measured in the second part and the resistance value measured in the second part, and the deterioration of the tank proceeds by detecting this resistance value difference. Can be detected. Although the electric resistance value of the tank is affected by the temperature of the tank, if the difference between the electric resistance values of the two portions of the tank 1 is taken as in this embodiment, the influence of the temperature can be canceled. The degree of deterioration of the tank can be detected without being affected by the temperature of the tank. In particular, as shown in FIG. 7, the first resistance measuring device 231 is attached to a portion of the outer periphery of the tank body where rain is directly applied (or the inner surface of the tank), and the second resistance measuring device 232 is attached to the rain on the outer surface of the tank. If it is attached to a part that is not directly exposed (part where corrosion is likely to occur due to salt damage), the resistance value measured by the first resistance measuring instrument and the second resistance measuring instrument when the deterioration of the tank progresses By increasing the difference from the resistance value, the degree of deterioration of the tank can be detected more reliably.

  In addition, when the first resistance measuring device 231 and the second resistance measuring device 232 are attached to the tank and the degree of deterioration of the tank is detected, a plurality of the second resistance measuring devices 232 are provided. By attaching the second resistance measuring device to each of a plurality of attachment locations set at portions where the tank easily corrodes, the corrosion of the tank can be detected more reliably. As described above, when a plurality of second resistance measuring devices 232 are provided, the electrical resistance value detected by each second resistance measuring device 232 is compared with the electrical resistance value measured by the first resistance measuring device 231. For example, when the difference between the electrical resistance value measured by at least one second resistance measuring device 232 and the electrical resistance value measured by the first resistance measuring device 231 is equal to or greater than a determination value, the deterioration state detection signal Is output.

  In the above-described embodiment, when measuring the electrical resistance value of the tank 1 to detect the deterioration of the tank, in order to eliminate the influence of the temperature of the tank on the electrical resistance value, the first resistance measuring device 231 and the second resistance measuring device 231 A resistance measuring instrument 232 is provided to take the difference between the electrical resistance values measured by both resistance measuring instruments, but the resistance measuring instrument is provided with a resistance measuring instrument and a temperature sensor that detects the temperature of the tank. The effect of temperature may be eliminated by converting the electrical resistance value into an electrical resistance value at a standard temperature.

  FIG. 9 shows an example in which a resistance measuring device and a temperature sensor are attached to a portion of the tank 1 that is susceptible to corrosion. In this example, a resistance measuring device 241 is attached to a portion of the bottom wall 101d near the leg 101d of the tank body 101, and a temperature sensor 242 for detecting the temperature of the tank 1 is also attached to the bottom wall 101d.

  When the resistance measuring device 241 and the temperature sensor 242 are attached to the tank 1 as shown in FIG. 9, the deterioration state detection unit 2 includes the resistance measuring device 241, the temperature sensor 242, and the resistance measuring device as shown in FIG. A corrected resistance value calculation unit that converts the resistance value measured by the temperature sensor 241 into a resistance value at a standard temperature (for example, 25 ° C.) using the temperature of the tank detected by the temperature sensor 242 and an arithmetic expression obtained in advance. When the resistance value calculated by the correction resistance value calculation unit 243 is equal to or greater than the determination value by comparing the resistance value calculated by the correction resistance value calculation unit 243 with a predetermined determination value, The comparison determination unit 244 outputs a deterioration state detection signal indicating that the degree of deterioration of the tank has reached the set degree.

  In the example shown in FIG. 9, the temperature sensor 242 is attached to the bottom wall portion of the tank so that the temperature near the portion where the electrical resistance value of the tank is measured is directly measured. You may make it measure indirectly by methods, such as measuring the temperature of the insulating oil accommodated in this.

  As shown in FIG. 9, a resistance measuring device 241 and a temperature sensor 242 are provided, and the resistance value of the tank determined by converting the electrical resistance value of the tank measured by the resistance measuring device 241 into the resistance value at the standard temperature is determined. Even when it is determined that the deterioration of the tank is progressing when the value is equal to or greater than the value, the deterioration of the tank is advanced by providing a plurality of resistance measuring devices 241 and attaching the plurality of resistance measuring devices to different portions of the tank. It can be detected more reliably.

  When detecting the degree of deterioration of the tank using a resistance measuring device, each resistance measuring device may be attached to measure the resistance value in the thickness direction of the tank. That is, a current that flows when a pair of electrodes opposed to each other with a portion for measuring the resistance value of the tank are electrically connected to the tank and a constant DC voltage is applied between these electrodes. The electrical resistance value in the thickness direction of the tank may be measured by measuring.

  When electrodes are connected to the tank in order to measure the electrical resistance value of the tank, the connection between each electrode and the tank is electrically connected to the tank in order to prevent the occurrence of corrosion starting from the connection between each electrode and the tank. It is preferable to perform the electrodeposition coating before applying the electrodeposition coating, and to cover the portions other than the connection portion of each electrode with the tank together with the tank with the anticorrosive coating film.

  Further, the tank event to be detected in order to detect the deterioration of the tank may be a change in the color (rust color) of the tank that occurs as the corrosion of the tank progresses. When the change in the color of the tank is to be detected, the color sensor attached to the tank detects the color of the easily corroded part of the tank, and the tank deteriorates when the detected color becomes a predetermined color. A degradation state detection signal indicating that is progressing is generated.

  FIG. 11 shows an example of a state in which a color sensor is attached to the tank. In this example, the color is attached to the bottom wall portion 101b of the tank body 101 and detects the color change of the inner surface of the tank leg portion 101d. A sensor 251 and / or a color sensor 251 ′ that is attached to the outer peripheral portion of the tank main body 101 and detects a color change inside the flange portion 101 c at the upper end of the tank main body is provided. As the color sensor, for example, the color of the detection target received through the lens is divided into three components of red (R), green (G), and blue (B) by a filter, and then the R component, G component, and B component are divided. The intensity of the three components is detected by a semiconductor sensor sensitive to single colors of R, G, and B, respectively, and the detection target color is discriminated from the ratio of the detected R component, G component, and B component. A commercially available product can be used.

  FIG. 12 shows a configuration example of the deterioration state detection unit 2 when detecting the degree of deterioration of the tank from the color detected by the color sensor 251. In the illustrated example, the color sensor 251 and the color sensor 251 include The deterioration state detection unit 2 is configured by a determination unit 252 that outputs a deterioration state detection signal when it is determined that the detected color is a set rust color (for example, brown or reddish brown). The configuration of the deterioration state detection unit in the case of providing a color sensor 251 ′ for detecting the color under the flange portion at the upper end of the tank body is the same as the example shown in FIG.

  Further, when the tank corrodes, the dielectric constant of the tank changes. Therefore, the degree of deterioration of the tank can also be determined by detecting the change in the dielectric constant of the tank as a detection target.

  When the change in the dielectric constant accompanying the deterioration of a specific part of the tank 1 is to be detected, the deterioration detection sensor is a pair of opposingly arranged so as to face the tank in the thickness direction with the specific part of the tank in between. It can be configured to detect the capacitance of a capacitor formed between the electrodes. In this case, the capacitance between the pair of electrodes is determined by the thickness of the coating film of the tank existing between the pair of electrodes, the thickness of the metal oxide constituting the tank, the dielectric constant of the coating film, and the dielectric constant of the oxide. It depends on the rate and the area of the electrode. In this case, the deterioration state detection unit is configured to generate a deterioration state detection signal when it is detected that the capacitance detected by the deterioration detection sensor has reached the set determination value.

  The fact that the capacitance has reached the judgment value is, for example, that an oscillation circuit is constituted by a capacitor constituted by a pair of electrodes arranged opposite each other with a specific portion of the tank in between and an active element such as a transistor. This can be easily detected by causing the oscillation circuit to oscillate when the corrosion of the tank proceeds and the capacitance of the capacitor reaches a predetermined determination value.

  Of the events detected in the tank due to deterioration of the tank of the pole transformer, the change in the tank vibration caused by the vibration generated in the transformer body being transmitted to the tank, and the progress of tank corrosion Detects one of the following: change in electrical resistance of tank caused by tank, change in tank color caused by tank corrosion, and change in tank dielectric constant caused by progress of tank corrosion In order to further ensure the detection of the deterioration of the tank, among the events detected in the tank as the tank 1 deteriorates, a plurality of events that reflect the degree of deterioration of the tank are included. A plurality of types of deterioration detection sensors are provided as detection targets, respectively, and it is determined that the degree of tank deterioration has been set from a signal output from any of the plurality of types of deterioration detection sensors. When it is, it may be configured the deterioration state detecting unit so as to generate a deterioration state detection signal.

  When configured in this way, a plurality of events to be detected are accompanied by a change in the state of vibration caused by electromagnetic vibration generated in the transformer body due to deterioration of the tank and deterioration of the tank. It is selected from four events consisting of a change in the electrical resistance of the tank that occurs, a change in the color of the tank that occurs as the tank deteriorates, and a change in the dielectric constant of the tank that occurs as the tank deteriorates.

  In the above embodiment, the portion where the rain of the tank is not directly applied is selected as the place where the deterioration of the tank is likely to occur. However, in order to reliably detect the deterioration of the tank, the coating film of the tank is used. For example, by deliberately thinning a part of the tank, the part where the phenomenon that the deterioration first reflected appears when the tank is near the end. Various sensors may be attached so as to detect an event occurring in the target portion. It is preferable to provide the detection target portion where the corrosion easily progresses in a portion such as the leg portion 101d provided at the bottom of the tank 1 that does not cause leakage of the insulating medium in the tank even if the corrosion occurs. Also, when the tank is approaching the end of its life, it is the first metal piece whose thickness is set so as to cause corrosion in a form that can be detected first from the outside (preferably made of the same metal material as that constituting the tank) Can be attached to the bottom of the tank or the like, and this metal piece can be used as a detection target portion.

  In each of the above-described embodiments, the degradation state detection signal transmission unit 3 transmits a signal indicating that the degradation state detection unit 2 is functioning normally to the parent station when there is a transmission request from the parent station. It is preferable to be configured as follows.

  When configured as described above, when the master station does not receive a signal indicating that the deterioration state detecting unit 2 is functioning normally, the deterioration state detection provided in the electrical equipment for distribution is detected. Since it is possible to detect that an abnormality has occurred in the constituent elements such as the sensor of the unit and the power supply unit, it is possible to appropriately perform maintenance management of the electrical equipment for power distribution.

  In the above embodiment, the degradation state detection signal transmission unit 3 transmits the signal obtained by modulating the carrier signal with the degradation state detection signal to the parent station 4 when there is a transmission request from the parent station. If possible, the deterioration state detection signal transmission unit 3 may be configured to transmit the deterioration state detection signal output from the deterioration detection sensor 2 to the master station 4 through the communication means as it is.

  In the above embodiment, the case where the present invention is applied to a pole transformer has been described. However, the present invention can also be applied to other electrical distribution equipment such as an automatic voltage regulator (SVR). It is.

DESCRIPTION OF SYMBOLS 1 Tank of electrical equipment for power distribution 2 Degradation state detection part 201 Degradation detection sensor 202 Amplifying circuit 203 Comparison determination part 211 Vibration measuring device 212 Filter 213 Comparison determination part 221 1st vibration measuring instrument 222 2nd vibration measuring instrument 223 Vibration level Difference calculation unit 224 Comparison determination unit 231 First resistance measurement device 232 Second resistance measurement device 241 Resistance measurement device 242 Temperature sensor 243 Correction resistance value calculation unit 244 Comparison determination unit 251 Color sensor 251 ′ color sensor 252 Determination unit 3 Degradation Status detection signal transmitter 4 Master station

Claims (16)

In electrical appliances for power distribution that are housed in metal tanks,
Among the events detected in the tank, there is a deterioration detection sensor that detects at least one event that reflects the degree of deterioration of the tank, and the deterioration of the tank using the output of the deterioration detection sensor A deterioration state detection unit that outputs a deterioration state detection signal including information on the degree of
A degradation state detection signal transmitter for transmitting the degradation state detection signal to a master station installed in a distribution system;
Electrical equipment for power distribution characterized by comprising: The event to be detected is a change in the state of vibration of the tank caused by transmission of vibration generated by the electric device body, and the deterioration detection sensor includes information on a vibration waveform of the tank. Configured to output electrical signals,
The electrical equipment for distribution according to claim 1, wherein the deterioration state detection unit is configured to output an electric signal including information on a vibration waveform detected by the deterioration detection sensor as the deterioration state detection signal. The event to be detected is a change in the state of vibration of the tank caused by transmission of vibration generated by the electric device body, and the deterioration detection sensor includes information on a vibration waveform of the tank. Configured to generate electrical signals,
The deterioration state detection unit determines a degree of deterioration of the tank from a waveform of an electric signal output by the deterioration detection sensor, and outputs the deterioration state detection signal when the degree of deterioration exceeds a set range. The electrical equipment for power distribution according to claim 1 configured to output. The event to be detected is a change in the state of vibration of the tank caused by transmission of vibration generated by the electric device body, and the deterioration detection sensor includes information on a vibration waveform of the tank. Configured to generate electrical signals,
The deterioration state detection unit determines the degree of deterioration of the tank by comparing the level of a specific frequency component extracted from the electrical signal output from the deterioration detection sensor through a filter with a determination value. The electrical equipment for power distribution according to claim 1, configured to output the deterioration state detection signal when it is determined that the degree of power exceeds a set range. The event to be detected is a change in the vibration level of the tank caused by transmission of vibration generated by the electric device body, and the vibration level of the tank is measured at the first portion of the tank. And a second vibration measuring device for measuring a vibration level of the tank at a second portion set at a position away from the first portion of the tank. Provided as
The deterioration state detection unit uses the difference between the vibration level measured by the first vibration measuring device and the vibration level measured by the second vibration measuring device when the tank is not deteriorated as a determination value, The deterioration state detection signal is output when the difference between the vibration level measured by the first vibration measuring instrument and the vibration level measured by the second vibration measuring instrument is equal to or greater than the determination value. The electrical equipment for power distribution according to claim 1, wherein   The first portion of the tank is set to a portion where rainwater on the outer surface of the tank is directly applied or the inner surface of the tank, and the second portion of the tank is set to a portion where rainwater on the outer surface of the tank is not directly applied. Item 6. The electrical equipment for power distribution according to Item 5. The event to be detected is a change in the electrical resistance of the tank, and the first resistance measuring device that measures the electrical resistance of the first portion of the tank and the first portion of the tank are separated from each other. A second resistance measuring device for measuring the electrical resistance of the second portion set at the position is provided as the deterioration detection sensor,
The deterioration state detection unit outputs the deterioration state detection signal when a difference between a resistance value measured by the first resistance measuring instrument and a resistance value measured by the second resistance measuring instrument is equal to or larger than a set value. The electrical equipment for power distribution according to claim 1, wherein the electrical equipment is for power distribution.   The first portion of the tank is set to a portion where rainwater on the outer surface of the tank is directly applied or the inner surface of the tank, and the second portion of the tank is set to a portion where rainwater on the outer surface of the tank is not directly applied. Item 8. The electrical equipment for power distribution according to Item 7. A temperature sensor for directly or indirectly measuring the temperature of the tank is provided;
The event to be detected is a change in the electrical resistance of the tank, and the deterioration detection sensor comprises a resistance measuring instrument that measures the electrical resistance of a set specific part of the tank,
The deterioration state detection unit converts the resistance value measured by the resistance measuring instrument into a resistance value at a predetermined standard temperature using the temperature detected by the temperature sensor, and the converted resistance value is determined in advance. The electrical equipment for power distribution according to claim 1, wherein the electrical equipment for distribution is configured to output the deterioration state detection signal when the value is equal to or greater than a value. The event to be detected is a change in the color of the tank that occurs with the deterioration of the tank, and the deterioration detection sensor comprises a color sensor that detects the color of a set specific part of the tank,
The electrical equipment for power distribution according to claim 1, wherein the deterioration state detection unit is configured to output a signal including color information detected by the color sensor as the deterioration state detection signal. The event to be detected is a change in the color of the tank that occurs with the deterioration of the tank, and the deterioration detection sensor comprises a color sensor that detects the color of a set specific part of the tank,
The deterioration state detection unit determines the degree of deterioration of the specific portion of the tank from the color detected by the color sensor, and the deterioration state when the determined degree of deterioration exceeds a preset range. The electrical equipment for power distribution according to claim 1, wherein the electrical equipment is configured to generate a detection signal. The event to be detected is a change in permittivity associated with the deterioration of a set specific portion of the tank, and the deterioration detection sensor is a pair of electrodes arranged opposite to each other with the specific portion of the tank in between. Configured to detect the capacitance between
The deterioration state detection unit is configured to generate the deterioration state detection signal when it is detected that the capacitance detected by the deterioration detection sensor is equal to or higher than a set determination value. The electrical equipment for power distribution according to claim 1.   The electrical equipment for power distribution according to claim 9, 10, 11 or 12, wherein the specific part of the tank is set to a part where rainwater is not directly applied to the outer surface. In electrical appliances for power distribution that are housed in metal tanks,
From signals output from any of the plurality of deterioration detection sensors, each of which includes a plurality of deterioration detection sensors that detect a plurality of events that reflect the degree of deterioration of the tank among the events detected in the tank. A deterioration state detection unit that generates a deterioration state detection signal when it is determined that the degree of deterioration of the tank has reached a set degree;
A degradation state detection signal transmitter for transmitting a degradation state detection signal generated by the degradation state detection unit to a master station installed in a distribution system; and
Electrical equipment for power distribution characterized by comprising:   The plurality of events to be detected include tanks that are generated as vibrations generated in the tank due to transmission of vibrations generated in the electric device main body, changes in the electric resistance of the tanks, and deterioration of the tanks. The electrical equipment for power distribution according to claim 14, wherein the electrical distribution equipment is selected from four events including a change in color of the tank and a change in dielectric constant of the tank caused by deterioration of the tank.   16. The electrical appliance for power distribution according to claim 14 or 15, wherein the detection of the event to be detected is performed in a specific portion set in a portion where rainwater is not directly applied to an outer surface of each portion of the tank. .

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